Grinding-wheel dresser



June 16, 1925. 1,542,343

A. M. DRAKE GRINDING WHEEL DRESSER Filed July 1, 1922 2 Sheets-Sheet 2 ,QZdeTa 772. ,DraKe Patented June 16, 1925.

UNITED STATES PATENT OFFICE.

ALDEN M. DRAKE OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO THE HEALD MA- CHINE COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA- GRINDING-WHEEL DRESSER.

Application filed July 31, 1922.

To all Whom it may concern:

Be it known that I, ALDEN M. DRAKE, a citizen of the United States, residing at \Vorcester, in the county of \Vorcester and Commonwealth of Massachusetts, have inrented a new and useful Improvement in a Grinding-\Vheel Dresser, of which the following, together with the accompanying drawings, is a specification.

The present invention relates to grinding machines, and in particular to 'means employed for dressing and truing the wheels of such machines.

The invention resides in the provision of a wheel dressing and truing device which is readily shiftable into and out of operative relation to the grinding wheel,the arrangement being such as to preserve and insure a rigid and firm mounting for the dresser in its operative position, and, at the same time, permit of free access to the work when the" dresser is not in use. Other and further objects and advantages of the invention will appear in the following detailed description, reference being had to the accompanying drawings, wherein Fig. 1 is a view, in side elevation, showing a grinding machine with the invention applied thereto. J

Fig. 2 is a detached view, on a larger scale, showing the construction of the dresser and its holder.

Fig. 3 is a plan view of the invention.

Like reference characters refer to like parts in the different figures.

For purposes of illustration, the dresser is here shown as applied to an internal grinder, having at one end the usual spindle 1 for supporting and rotating the piece of work 2, the spindle 1 being driven at moderate speed by a belt 3. At the other end of the machine, journalled in suitable bearings 4 of a slidable head 5, is the grinding wheel spindle 6, which is driven at high speed by a belt 7. The movement of head 5 on suitable longitudinal ways provided by the machine frame, carries the rotating grinding wheel 8, on the end of spindle 6, into and out of contact with the work on spindle 1, in the manner well known in machines of this class.

The wheel truing device, or diamond, is mounted on a suitable bridge 9, extending transversely of the machine and straddling the ways in which the head 5 slides, said Serial N0. 578,664.

desired position of adjustment on the bridge 9, a mounting or holder 14 for the diamond.

This mounting or holder 14 presents an extended base portion in contact with the bridge 9, and integral with said base portion a cylindrical enlargement 15, which is laterally offset in the direction of wheel head 5, i. e., away from the work on spindle 1. The cylindrical enlargement 15 provides a bore 16 for the passage of a bolt. or shaft 17, the latter carrying on its inner end, adjacent to its head 18, a substantially cylindrical member 19, having lugs 20, for engaging the head 18, to constrain rotation of member 19 with said bolt 17. The outwardly projecting end of bolt 17 is encircled by a washer 21, the latter being constrained against rotation relative to the bolt by a pin 22 which enters an elongated keyway 23. Beyond the washer 21, the bolt 17-is reduced in diameter, and is threaded to receive a threaded split collar 24, adapted to be fixed in any desired position by a tightening bolt 25.

The member 19 presents an extended surface in contact with the inner face of enlargement 15, and provides an arm 26 extending laterally in the direction of the work spindle 1. \At its free end the arm 26 is enlarged at 27, to opening for the retention and adjustment of a diamond dresser 28, the latter projecting inwardly toward the path of wheel 8. Interposed between the washer 21 and the collar 24 is a compressible annular member 29, here shown in the form of a spring washer, bearing resiliently at opposite sides against the collar 24 and the washer 21. At its outer end the bolt 17 provides a handle 30, by which it may be turned in the bore 16 of cylindrical enlargement 15.

In the normal operation of the grinding rovide a threaded I machine, the wheel dressing and truing spindle 6. In this'position, there is no ob struction to the travel of the grinding head toward the work, and furthermore, there is no interference by the diamond with the hand or arm of the operator, in the act of gauging or testing the work. When it is desired to dress or true the wheel, the lat' ter is withdrawn from the work by movement of the head 5, and then the handle 30 is turned in a clockwise direction, until a lip 31 on member 19 engages a stop on the base mounting 14. This disposes the dresser 28 into the dotted line position shown in Fig. 1, substantially in the plane ofthe axis of wheel spindle 6, and enables the wheel surface to be dressed by reciprocating the wheel back and forth in contact with the diamond.

The bore 16 provides a snug bearing for the bolt 17, and the extended contact between the opposing surfaces of member 19 and enlargement l5 effectually prevents any undue vibration or chattering of the. diamond when in operative relation to the rotating wheel. The con'ipressible member 29 serves to hold these opposing surfaces in close contact, while at ihc same time allowing the bolt 17 to be turned, by handle 30, to carry the diamond into and out of operative position. The tension of member 2'?) is adjustable to vary the tightness with which the diamond is held, by changing the longitudinal position of the collar 24 on the threaded portion of the bolt 17.

My improved mounting for the W cl dressing member is particularly ad'- tageous because of the fact that the wheel dressing member is adapted to be moved. into and out of its operative position with respect to the grinding. wheel without changing the distance between the dressing member and the vertical plane of the grinding wheel axis. Therefore, with a given setting of the wheel dressing member, the diamond dresser will always be returned to the same operative position with respect to the grinding wheel, regardless of the number of times that the wheel dressing member may be swung downwardly into its inoperative position, In other words, the dressing point is constrained to move in a substantially vertical plane which is parallel the vertical plane of the grinding \Vilfjti axis.

I claim,-

1. In a grinding machine, a rotating rinding wheel, a bridge and a wheel dressing member adapted to be rendered inoperative by movement about a fixed axis provided by said brid e and extending substantially at right of said Wheel.

2. In a grinding machine, a rotating grinding wheel, a wheel dressing member, and a support therefor providing a pivotal axis extending substantially at right angles to the wheel axis for the movement of said member into and out of operative position, said support providing also an extended angles to the axis of rotation surface'in opposition to any other movement of said member, and means for exerting pressure to hold said member against said surface.

3. In a grinding machine, a rotating grinding wheel, a wheel dressing member, and a support therefor providing a pivotal axis extending substantially at right angles to the wheel axis for the movement of said member into and out of operative position, said support providing also an extended surface in opposition to any other movement of said member, means for exerting pressure to hold said'rnember against said surface, and means for varying-said pressure.

ALDEN M. DRAKE. 

